 |
| Titel |
Carbon monoxide mixing ratios over Oklahoma between 2002 and 2009 retrieved from Atmospheric Emitted Radiance Interferometer spectra |
| VerfasserIn |
L. Yurganov, W. McMillan, C. Wilson, M. Fischer, S. Biraud, C. Sweeney |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 5 ; Nr. 3, no. 5 (2010-10-05), S.1319-1331 |
| Datensatznummer |
250001294
|
| Publikation (Nr.) |
 copernicus.org/amt-3-1319-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| CO mixing ratios for the lowermost 2-km atmospheric layer were retrieved
from downwelling infrared (IR) radiance spectra of the clear sky measured
between 2002 and 2009 by a zenith-viewing Atmospheric Emitted Radiance
Interferometer (AERI) deployed at the Southern Great Plains (SGP)
observatory of the Atmospheric Radiation Measurements (ARM) Program near
Lamont, Oklahoma. A version of a published earlier retrieval algorithm was
improved and validated. Archived temperature and water vapor profiles
retrieved from the same AERI spectra through automated ARM processing were
used as input data for the CO retrievals. We found the archived water vapor
profiles required additional constraint using SGP Microwave Radiometer
retrievals of total precipitable water vapor. A correction for scattered
solar light was developed as well. The retrieved CO was validated using
simultaneous independently measured CO profiles from an aircraft. These
tropospheric CO profiles were measured from the surface to altitudes of
4572 m a.s.l. once or twice a week between March 2006 and December 2008.
The aircraft measurements were supplemented with ground-based CO
measurements using a non-dispersive infrared gas correlation instrument at
the SGP and retrievals from the Atmospheric IR Sounder (AIRS) above 5 km to
create full tropospheric CO profiles. Comparison of the profiles convolved
with averaging kernels to the AERI CO retrievals found a squared correlation
coefficient of 0.57, a standard deviation of ±11.7 ppbv, a bias of
-16 ppbv, and a slope of 0.92. Averaged seasonal and diurnal cycles measured by
the AERI are compared with those measured continuously in situ at the SGP in
the boundary layer. Monthly mean CO values measured by the AERI between 2002
and 2009 are compared with those measured by the AIRS over North America,
the Northern Hemisphere mid-latitudes, and over the tropics. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|